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Claude Fable 5 secretly throttled AI researchers, and the internet went wild

Claude Fable 5 gave users access to Mythos-class power, but its hidden safeguards turned a safety feature into a trust problem for Anthropic.

Raccontata dacryptobriefing.combusinessinsider.combenzinga.comindependent.co.uktomsguide.comtheguardian.cominterconnects.aitimesofindia.indiatimes.comthehindu.comthehackernews.comynetnews.comgadgetsnow.indiatimes.com+5 altre

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6 prospettive sulla stessa storia
AI · summaries
zdnet.comStai leggendo3 g fa

Claude Fable 5 secretly throttled AI researchers, and the internet went wild

Anthropic's Fable 5 silently downgraded frontier LLM research to weaker models without user notification. Tech leaders should assess: vendors can invisibly constrain AI capabilities under safety claims, affecting your stack decisions and security posture.

originale
fortune.com5 g fa

Anthropic accused of 'secret sabotage' as Claude Fable 5 silently limits capabilities for AI researchers and…

A paragraph buried in Fable 5's 319-page system card revealed the model would silently downgrade its responses for certain AI development work — without telling users.

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tomsguide.com5 g fa

Claude Fable 5 is here — and it's based on a model Anthropic once deemed too risky for the public

This version comes with guardrails that block some of its most powerful capabilities

Leggi questa versione → originale
thehackernews.com5 g fa

Anthropic Releases Claude Fable 5, Its Most Powerful AI Yet, With Cyber Safeguards

Anthropic split Fable 5 and Mythos 5 by cyber safeguards, giving vetted defenders stronger capabilities while limiting public misuse.

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theguardian.com5 g fa

Anthropic releases ‘safe’ version of Claude Mythos AI model to public

AI company restricted access to Fable 5, its most powerful Mythos model, for months over cybersecurity concerns

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cryptobriefing.com3 g fa

Anthropic faces backlash over stricter safeguards on Claude model

Anthropic rolled back Fable 5's hidden safeguards after 24h: model silently downgraded sensitive-topic responses without disclosure. For tech leaders: responsible AI credibility needs transparent guardrails, not covert restrictions—trade-offs must be explicit.

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Timeline cronologica

  1. martedì 9 giugno 2026·cryptobriefing.com

    Anthropic makes Mythos model available to users through safer Claude Fable 5 release

    Anthropic launched Claude Fable 5 with safeguards for high risk tasks while limiting Mythos 5 to trusted cyber partners.

  2. martedì 9 giugno 2026·businessinsider.com

    Anthropic releases Claude Fable 5, a 'Mythos-class' AI model with safeguards

    Anthropic said it could not yet release the full Claude Mythos 5 model, so instead it created Fable 5 with baked in safeguards.

  3. martedì 9 giugno 2026·benzinga.com

    Anthropic Rolls Out Fable 5, Mythos 5—One Comes With Limits

    Anthropic launched Claude Fable 5, its most capable consumer-facing AI model to date, but with a few guardrails.

  4. martedì 9 giugno 2026·independent.co.uk

    Anthropic releases ‘too dangerous’ AI Model with safeguards in place

    Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.Jump to contentThank you for registeringPlease refresh the page or…

  5. martedì 9 giugno 2026·tomsguide.com

    Claude Fable 5 is here — and it's based on a model Anthropic once deemed too risky for the public

    This version comes with guardrails that block some of its most powerful capabilities

  6. mercoledì 10 giugno 2026·theguardian.com

    Anthropic releases ‘safe’ version of Claude Mythos AI model to public

    AI company restricted access to Fable 5, its most powerful Mythos model, for months over cybersecurity concerns

  7. mercoledì 10 giugno 2026·interconnects.ai

    Claude Fable 5 and new safety fables

    One step further into the power politics of frontier AI systems.

  8. mercoledì 10 giugno 2026·cryptobriefing.com

    Anthropic rolls out public version of Mythos AI model with restrictions on cybersecurity use

    Anthropic launches Claude Mythos 5 for restricted cybersecurity use and Claude Fable 5 for the public, splitting its most powerful AI model into two tiers.

  9. mercoledì 10 giugno 2026·timesofindia.indiatimes.com

    Anthropic's Claude Fable 5 is here: The Mythos-class AI model anyone can now use and what makes it different

    Anthropic has launched Claude Fable 5, the first publicly available version of its Mythos-class AI model. The launch of this AI model comes roughly two months after Mythos was…

  10. mercoledì 10 giugno 2026·thehindu.com

    Anthropic opens Fable 5, restricted version of Claude Mythos 5, to public

    Anthropic, maker of the Claude artificial intelligence (AI) models, made the most powerful version of its technology available to the general public

  11. mercoledì 10 giugno 2026·thehackernews.com

    Anthropic Releases Claude Fable 5, Its Most Powerful AI Yet, With Cyber Safeguards

    Anthropic split Fable 5 and Mythos 5 by cyber safeguards, giving vetted defenders stronger capabilities while limiting public misuse.

  12. mercoledì 10 giugno 2026·ynetnews.com

    ‘Too dangerous for the public’: Anthropic releases its most powerful AI model yet

    Claude Fable 5 is designed to tackle complex projects over days or weeks with minimal human oversight, while its unrestricted sibling remains limited to security and critical…

  13. mercoledì 10 giugno 2026·gadgetsnow.indiatimes.com

    Anthropic unveils claude Fable 5, bringing its powerful Mythos AI to the public

    Find latest technology news, gadgets reviews & ratings. Popular & latest gadgets specifications, features, prices, photos & videos. Trending mobile phone comparisons, slideshows,…

  14. mercoledì 10 giugno 2026·siliconrepublic.com

    Anthropic rolls out ‘Mythos-like’ AI model Claude Fable 5

    Anthropic has unveiled Claude Fable 5, a model similar to Claude Mythos but with major cyber barriers blocking risky prompts and replies.

  15. mercoledì 10 giugno 2026·thehindubusinessline.com

    Anthropic launches Claude Fable 5, a Mythos-class model made safe for general use

    Anthropic unveils Claude Fable 5, a powerful, safe Mythos-class AI model designed for diverse applications and enhanced performance.

  16. mercoledì 10 giugno 2026·economictimes.indiatimes.com

    Claude Fable 5 & Mythos 5: Key highlights from Anthropic’s latest launch - The Economic Times

    Anthropic has launched Claude Fable 5, its most capable publicly available AI model, excelling in complex tasks and benchmarks. Alongside it, Mythos 5, a restricted version with…

  17. mercoledì 10 giugno 2026·mashable.com

    Using Claude Fable 5 means opting into data collection

    Anthropic released a 'safe' version of Claude Mythos — and changed its data retention policy for the model, too.

  18. mercoledì 10 giugno 2026·cryptobriefing.com

    Cybersecurity researchers criticize Anthropic's Fable for strict guardrails that block defensive work

    Anthropic's Claude Fable 5 faces backlash from cybersecurity researchers who say its safety classifiers block legitimate vulnerability research and

  19. mercoledì 10 giugno 2026·fortune.com

    Anthropic accused of 'secret sabotage' as Claude Fable 5 silently limits capabilities for AI researchers and developers | Fortune

    A paragraph buried in Fable 5's 319-page system card revealed the model would silently downgrade its responses for certain AI development work — without telling users.

  20. mercoledì 10 giugno 2026·fortune.com

    Anthropic accused of ‘secret sabotage’ as Claude Fable 5 silently limits capabilities for AI researchers and developers | Fortune

    A paragraph buried in Fable 5’s 319-page system card revealed the model would silently downgrade its responses for certain AI development work—without telling users.